Flywheel energy storage integrated device for improving primary frequency modulation capability of wind turbine generator system

Abstract

The utility model relates to the field of wind power technology discloses the flywheel energy storage integrated device of promotion wind turbine unit primary frequency modulation ability, including the substrate, fixed installation on the upper surface of substrate wind turbine unit speed increasing gear box and generator, set up between wind turbine unit speed increasing gear box and generator wind power main shaft coupling unit, and through the support installation on the upper surface of substrate flywheel energy storage core unit, wherein, the input of wind turbine unit speed increasing gear box is connected with flywheel energy storage core unit transmission, and the output is connected with the input of generator transmission through wind power main shaft coupling unit transmission. The utility model effectively promotes the primary frequency modulation ability of wind turbine unit, alleviates the impact of wind power output instability to power grid frequency, guarantees power grid frequency stability.

Description

Technical Field

[0001] This utility model relates to the field of wind power technology, specifically to a flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine generators. Background Technology

[0002] As the energy structure undergoes a profound transformation towards cleaner and more renewable energy sources, the installed capacity and power generation of new energy power generation (such as wind power and photovoltaics) continue to rise in the power system. Energy storage technology, as a core support for addressing fluctuations in new energy output and ensuring grid power balance, has become a key research direction in the energy sector. Among various energy storage technologies, flywheel energy storage, with its outstanding advantages of high power density, high energy conversion efficiency, long service life, and no chemical pollution, demonstrates technological value that traditional electrochemical energy storage cannot replace in scenarios requiring rapid power response (such as grid frequency regulation and new energy grid connection support), and is gradually becoming one of the preferred solutions in the field of high dynamic response energy storage.

[0003] As a major force in new energy power generation, wind power's clean and renewable characteristics make it an important force in achieving energy conservation goals. However, its output stability is directly constrained by the characteristics of wind energy—wind energy has inherent intermittency (such as differences between day and night wind conditions) and volatility (such as the impact of instantaneous gusts), causing the actual output power of wind turbines to be constantly changing. This directly results in an inherent deficiency in the ability of wind turbines to regulate the grid frequency, especially their "primary frequency regulation capability." Primary frequency regulation is the "first line of defense" when the grid frequency deviates, requiring power generation equipment to respond to frequency changes and adjust output within hundreds of milliseconds to several seconds. However, wind turbines are affected by factors such as wind energy transmission delays and limited pitch adjustment speed, making it impossible for them to meet this rapid response requirement.

[0004] When the power grid experiences frequency deviations from the rated value (50Hz in my country's power frequency standard) due to sudden load changes (such as the switching of large electrical equipment), traditional wind turbines are unable to quickly replenish the power deficit or absorb surplus power. Not only can they not help the power grid restore frequency stability, but they may also exacerbate the frequency oscillation of the power grid due to their own output fluctuations. In severe cases, they may even trigger the power grid protection mechanism, causing the wind turbines to disconnect from the grid and threatening the safe operation of the regional power system. Utility Model Content

[0005] This invention provides a flywheel energy storage integrated device to improve the primary frequency regulation capability of wind turbine generators, thereby solving the above-mentioned problems.

[0006] In a first aspect, this utility model provides a flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine generators, comprising: substrate; A wind turbine speed-increasing gearbox and a generator are fixedly mounted on the upper surface of the substrate; The wind turbine main shaft coupling unit is disposed between the speed-increasing gearbox and the generator of the wind turbine unit; and A flywheel energy storage core unit is mounted on the upper surface of the substrate via a support. The input end of the wind turbine speed-increasing gearbox is connected to the flywheel energy storage core unit, and the output end is connected to the input end of the generator through the wind turbine main shaft coupling unit.

[0007] The base plate, as the fundamental load-bearing structure of the entire device, provides a stable mounting reference for the wind turbine speed-increasing gearbox, generator, wind turbine main shaft coupling unit, and flywheel energy storage core unit mounted via supports. This ensures that the relative positions of each component remain fixed during operation, preventing installation misalignment from affecting power transmission and functionality, and laying a structural foundation for the stable operation of the overall system. The wind turbine speed-increasing gearbox plays a crucial role in speed adaptation and power distribution. Its input end establishes a transmission connection with the flywheel energy storage core unit, and its output end is connected to the generator input end via the wind turbine main shaft coupling unit. This allows the low speed generated after the wind turbine captures wind energy to be increased to a high speed that matches the generator's power generation needs and the flywheel energy storage core unit's energy storage requirements, achieving reasonable distribution and efficient transmission of power along the "wind turbine-flywheel energy storage core unit" and "wind turbine-generator" paths. The wind turbine main shaft coupling unit, as the transmission intermediary between the wind turbine speed-increasing gearbox and the generator, ensures stable power transmission after speed increase, enabling the generator to continuously convert received mechanical energy into electrical energy and feed it into the grid. In a primary frequency regulation scenario, the flywheel energy storage core unit achieves flexible energy regulation through its transmission cooperation with the wind turbine's speed-increasing gearbox: when the grid frequency is lower than the rated value, the flywheel energy storage core unit releases the stored kinetic energy, which is then accelerated by the wind turbine's speed-increasing gearbox and transmitted to the generator through the wind turbine's main shaft coupling unit, helping the generator to output additional electrical energy to supplement the grid's power deficit; when the grid frequency is higher than the rated value, the flywheel energy storage core unit absorbs the surplus energy from the grid through the wind turbine's speed-increasing gearbox, converting it into kinetic energy storage, while reducing the generator's output power to the grid. In this way, the various components work together to quickly respond to changes in grid frequency, effectively improving the wind turbine's primary frequency regulation capability, mitigating the impact of unstable wind power output on the grid frequency, and ensuring grid frequency stability.

[0008] In one optional implementation, the flywheel energy storage core unit includes: Vacuum chamber; A rotating spindle is installed inside the vacuum chamber; A carbon fiber flywheel fixed to the rotating main shaft; Magnetic levitation bearing assemblies respectively disposed at both ends of the rotating main shaft; and A permanent magnet synchronous motor is installed inside the vacuum chamber and cooperates with the rotating main shaft.

[0009] In one alternative embodiment, the magnetic levitation bearing assembly includes: A first magnetic levitation bearing is fixed inside the vacuum chamber on the left side; The second magnetic levitation bearing is fixed inside the vacuum chamber on the right side; and A magnetic bearing controller is located outside the vacuum chamber and is electrically connected to the first and second magnetic bearings.

[0010] In one alternative embodiment, the left end of the rotating main shaft is fixedly connected to the input end of the wind turbine speed-increasing gearbox via a first diaphragm-type flexible coupling.

[0011] In one optional embodiment, a connecting pipe is fixedly connected to the right side of the vacuum chamber, and a vacuum tube is connected to the right end of the connecting pipe via a flange.

[0012] In one alternative embodiment, the carbon fiber flywheel is fixedly connected to the rotating main shaft via a flywheel hub.

[0013] In one alternative embodiment, the permanent magnet synchronous motor includes a stator portion fixed to a stator base and a rotor core fixed to the rotating main shaft.

[0014] In one optional implementation, the wind turbine main shaft coupling unit includes: A bracket fixed to the substrate; A torque sensor mounted on the bracket; and An overrunning clutch is disposed between the torque sensor and the generator input terminal.

[0015] In one alternative implementation, the torque sensor is connected to the output end of the wind turbine speed-increasing gearbox via a second diaphragm-type flexible coupling.

[0016] In one alternative embodiment, the generator is fixed to the base plate by a mounting platform. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a flywheel energy storage integrated device for improving the primary frequency regulation capability of a wind turbine according to an embodiment of the present invention; Figure 2 This is an external structural diagram of the flywheel energy storage core unit in a flywheel energy storage integrated device for improving the primary frequency regulation capability of a wind turbine according to an embodiment of the present invention. Figure 3 This is a cross-sectional view of a flywheel energy storage integrated device for improving the primary frequency regulation capability of a wind turbine according to an embodiment of the present invention. Figure 4 This is an external structural diagram of the wind turbine main shaft coupling unit in a flywheel energy storage integrated device for improving the primary frequency regulation capability of a wind turbine, according to an embodiment of this utility model.

[0019] Explanation of reference numerals in the attached figures: 1. Substrate; 2. Wind turbine speed-increasing gearbox; 3. Mounting platform; 4. Generator; 5. Support; 6. Flywheel energy storage core unit; 601. Vacuum chamber; 602. Pad block; 603. Magnetic levitation bearing controller; 604. First magnetic levitation bearing; 605. Second magnetic levitation bearing; 606. Rotating main shaft; 607. First diaphragm type flexible coupling; 608. Flywheel hub; 609. Carbon fiber flywheel; 610. Stator base; 611. Permanent magnet synchronous motor; 612. Rotor core; 613. Connecting pipe; 614. Vacuum tube; 7. Wind turbine main shaft coupling unit; 701. Bracket; 702. Connecting plate; 703. Torque sensor; 704. Overrunning clutch; 705. Second diaphragm type flexible coupling. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] As the energy structure undergoes a profound transformation towards cleaner and more renewable energy sources, the installed capacity and power generation of new energy power generation (such as wind power and photovoltaics) continue to rise in the power system. Energy storage technology, as a core support for addressing fluctuations in new energy output and ensuring grid power balance, has become a key research direction in the energy sector. Among various energy storage technologies, flywheel energy storage, with its outstanding advantages of high power density, high energy conversion efficiency, long service life, and no chemical pollution, demonstrates technological value that traditional electrochemical energy storage cannot replace in scenarios requiring rapid power response (such as grid frequency regulation and new energy grid connection support), and is gradually becoming one of the preferred solutions in the field of high dynamic response energy storage.

[0022] As a major force in new energy power generation, wind power's clean and renewable characteristics make it an important force in achieving the "dual carbon" goal. However, its output stability is directly constrained by the characteristics of wind energy—wind energy has inherent intermittency (such as differences between day and night wind conditions) and volatility (such as the impact of instantaneous gusts), causing the actual output power of wind turbines to be constantly changing. This directly results in an inherent deficiency in the ability of wind turbines to regulate the grid frequency, especially in their "primary frequency regulation capability." Primary frequency regulation is the "first line of defense" when the grid frequency deviates, requiring power generation equipment to respond to frequency changes and adjust output within hundreds of milliseconds to several seconds. However, wind turbines are affected by factors such as the delay in wind energy transmission and the limited speed of pitch adjustment, making it impossible for them to meet this rapid response requirement.

[0023] When the power grid experiences frequency deviations from the rated value (50Hz in my country's power frequency standard) due to sudden load changes (such as the switching of large electrical equipment), traditional wind turbines are unable to quickly replenish the power deficit or absorb surplus power. Not only can they not help the power grid restore frequency stability, but they may also exacerbate the frequency oscillation of the power grid due to their own output fluctuations. In severe cases, they may even trigger the power grid protection mechanism, causing the wind turbines to disconnect from the grid and threatening the safe operation of the regional power system.

[0024] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, a flywheel energy storage integrated device for improving the primary frequency regulation capability of a wind turbine is provided, comprising a base plate 1, a wind turbine speed-increasing gearbox 2 and a generator 4 fixedly mounted on the upper surface of the base plate 1, a wind turbine main shaft coupling unit 7 disposed between the wind turbine speed-increasing gearbox 2 and the generator 4, and a flywheel energy storage core unit 6 mounted on the upper surface of the base plate 1 via a support 5; wherein, the input end of the wind turbine speed-increasing gearbox 2 is drivenly connected to the flywheel energy storage core unit 6, and the output end is drivenly connected to the input end of the generator 4 via the wind turbine main shaft coupling unit 7.

[0026] The base plate 1 serves as the fundamental load-bearing structure of the entire device, providing a stable mounting reference for the wind turbine speed-increasing gearbox 2, generator 4, wind turbine main shaft coupling unit 7, and flywheel energy storage core unit 6 mounted via support 5. This ensures that the relative positions of each component remain fixed during operation, preventing installation misalignment from affecting power transmission and functionality, and laying a structural foundation for the stable operation of the overall system. The wind turbine speed-increasing gearbox 2 plays a core role in speed adaptation and power distribution. Its input end is connected to the flywheel energy storage core unit 6, and its output end is connected to the input end of the generator 4 via the wind turbine main shaft coupling unit 7. This allows the low speed generated after the wind turbine captures wind energy to be increased to a high speed that matches the power generation needs of the generator 4 and the energy storage needs of the flywheel energy storage core unit 6, achieving reasonable distribution and efficient transmission of power along the two paths: "wind turbine - flywheel energy storage core unit 6" and "wind turbine - generator 4". The wind turbine main shaft coupling unit 7, as the transmission intermediary between the wind turbine speed-increasing gearbox 2 and the generator 4, ensures the stable transmission of power after speed increase, enabling the generator 4 to continuously convert the received mechanical energy into electrical energy and feed it into the power grid. In a primary frequency regulation scenario, the flywheel energy storage core unit 6 achieves flexible energy regulation through its transmission cooperation with the wind turbine speed-up gearbox 2: when the grid frequency is lower than the rated value, the flywheel energy storage core unit 6 releases the stored kinetic energy, which is then accelerated by the wind turbine speed-up gearbox 2 and transmitted to the generator 4 through the wind turbine main shaft coupling unit 7, helping the generator 4 to output additional electrical energy to supplement the grid power deficit; when the grid frequency is higher than the rated value, the flywheel energy storage core unit 6 absorbs the surplus energy of the grid through the wind turbine speed-up gearbox 2, converts it into kinetic energy storage, and reduces the output power of the generator 4 to the grid. In this way, the components work together to quickly respond to changes in grid frequency, effectively improving the primary frequency regulation capability of the wind turbine, mitigating the impact of unstable wind power output on the grid frequency, and ensuring grid frequency stability.

[0027] In one embodiment, the flywheel energy storage core unit 6 includes a vacuum chamber 601, a rotating main shaft 606 disposed inside the vacuum chamber 601, a carbon fiber flywheel 609 fixed on the rotating main shaft 606, magnetic levitation bearing assemblies disposed at both ends of the rotating main shaft 606, and a permanent magnet synchronous motor 611 disposed inside the vacuum chamber 601 and cooperating with the rotating main shaft 606.

[0028] In this embodiment, the flywheel energy storage core unit 6 uses the vacuum chamber 601 as its core support and protection carrier, providing a closed and low-interference operating environment for the internal functional components, effectively reducing the impact of external factors on the core functions of the unit, and creating the basic conditions for the high-speed operation of components such as the rotating main shaft 606 and the carbon fiber flywheel 609. The rotating main shaft 606, as the core of the unit's power transmission, runs through the vacuum chamber 601, not only providing fixed support for the carbon fiber flywheel 609 so that it can rotate synchronously with the main shaft, but also achieving stable rotation through cooperation with the magnetic levitation bearing assemblies at both ends, and forming a linkage with the permanent magnet synchronous motor 611, becoming a key link for energy transfer and conversion. The carbon fiber flywheel 609, fixed on the rotating main shaft 606, is the core component of energy storage. Relying on its own material properties, it can achieve high-speed rotation under the drive of the main shaft, efficiently converting electrical or mechanical energy into kinetic energy for storage, providing reserves for energy release or absorption during subsequent grid frequency regulation. The magnetic levitation bearing assemblies located at both ends of the rotating main shaft 606 provide precise and contactless support, significantly reducing mechanical friction losses during shaft rotation and ensuring stable rotation. This prevents energy loss or component wear due to friction, ensuring high-speed and efficient energy storage for the flywheel. The permanent magnet synchronous motor 611, located within the vacuum chamber 601 and working in conjunction with the rotating main shaft 606, plays a crucial role in energy conversion. During energy storage, it converts electrical energy into mechanical energy to accelerate the rotating main shaft 606, increasing the speed of the carbon fiber flywheel 609 to store more kinetic energy. During energy release, the kinetic energy released by the carbon fiber flywheel 609 drives the rotating main shaft 606 to rotate, converting mechanical energy into electrical energy. This energy is then transmitted to the grid through the wind turbine's speed-increasing gearbox 2, enabling flexible energy conversion and regulation. This provides core energy support for the wind turbine to quickly respond to grid frequency changes and improve primary frequency regulation capabilities.

[0029] In one embodiment, the magnetic levitation bearing assembly includes a first magnetic levitation bearing 604 fixed inside the left side of the vacuum chamber 601, a second magnetic levitation bearing 605 fixed inside the right side of the vacuum chamber 601, and a magnetic levitation bearing controller 603 disposed outside the vacuum chamber 601 and electrically connected to the first magnetic levitation bearing 604 and the second magnetic levitation bearing 605.

[0030] In this embodiment, the magnetic levitation bearing assembly uses the vacuum chamber 601 as the core mounting carrier. Through a collaborative architecture of "dual bearings + external controller," it provides crucial support for the stable operation of the rotating main shaft 606 in the flywheel energy storage core unit 6. Specifically, the first magnetic levitation bearing 604, fixed to the left side inside the vacuum chamber 601, and the second magnetic levitation bearing 605, fixed to the right side inside the vacuum chamber 601, are symmetrically arranged. Together, they form a bidirectional, contactless support for the rotating main shaft 606. The magnetic field force disengages the rotating main shaft 606 from mechanical contact, reducing frictional losses typical of traditional mechanical bearings and creating a low-resistance operating environment for the high-speed rotation of the carbon fiber flywheel 609 driven by the rotating main shaft 606. The magnetic levitation bearing controller 603, located outside the vacuum chamber 601, works in conjunction with the first magnetic levitation bearing 604... The second magnetic levitation bearing 605 establishes a stable electrical connection, enabling real-time acquisition of the magnetic field status of the two bearings and the levitation position data of the rotating spindle 606. Based on the monitored information such as the radial runout of the spindle and the stability of the magnetic field, the control current output to the two magnetic levitation bearings is dynamically adjusted to precisely control the magnetic field strength and direction of the two bearings, ensuring that the rotating spindle 606 always maintains the preset levitation posture, effectively controlling the radial runout of the spindle within a small range, avoiding collisions with the internal components of the vacuum chamber 601 due to spindle offset, and ensuring the smoothness of the rotation of the rotating spindle 606.

[0031] In one embodiment, the left end of the rotating main shaft 606 is fixedly connected to the input end of the wind turbine speed-increasing gearbox 2 via a first diaphragm-type flexible coupling 607.

[0032] In this embodiment, the left end of the rotating main shaft 606 is fixedly connected to the input end of the wind turbine speed-increasing gearbox 2 via a first diaphragm-type flexible coupling 607, serving as the link for power connection between the flywheel energy storage core unit 6 and the wind turbine speed-increasing gearbox 2. On one hand, this connection structure can reliably transmit power: when the wind turbine drives the input end of the wind turbine speed-increasing gearbox 2 to rotate, the power can be transmitted to the rotating main shaft 606 via the first diaphragm-type flexible coupling 607, driving the rotating main shaft 606 and its carbon fiber flywheel 609 to rotate to store kinetic energy; and when grid frequency fluctuations require the flywheel to release energy, the rotational power of the rotating main shaft 606 can also be transmitted in the opposite direction to the wind turbine speed-increasing gearbox 2 via the coupling, and after speed-up, distributed to the power generation branch to supplement grid power. On the other hand, the first diaphragm-type flexible coupling 607 has elastic compensation characteristics, which can effectively offset the coaxiality deviation between the rotating main shaft 606 and the input end of the wind turbine speed-increasing gearbox 2 caused by installation errors or operating vibrations. It avoids rigid stress and wear on components caused by shaft misalignment, reduces the transmission of vibration between the two, and ensures the smoothness and reliability of the power transmission process. It provides an important connection guarantee for the entire device to efficiently respond to the primary frequency regulation requirements and stably realize energy conversion and distribution.

[0033] In one embodiment, a connecting pipe 613 is fixedly connected to the right side of the vacuum chamber 601, and a vacuum pipe 614 is connected to the right end of the connecting pipe 613 via a flange.

[0034] In this embodiment, the connecting pipe 613 fixedly connected to the right side of the vacuum chamber 601 is a key transitional structure for connecting the vacuum chamber 601 with the external vacuum extraction system. One end of the connecting pipe 613 is stably fixed to the body of the vacuum chamber 601, providing a channel foundation for the subsequent construction of the vacuum environment. The connection between the right end of the connecting pipe 613 and the vacuum pipe 614 via a flange ensures the airtightness of the connection between the two, effectively preventing air from seeping into the interior of the vacuum chamber 601 from the connection gap, thus avoiding damage to the low-pressure environment inside the vacuum chamber 601. It also provides convenient disassembly and assembly, facilitating subsequent maintenance and replacement of the vacuum pipe 614 or the vacuum extraction equipment. When the device enters the operation preparation stage, the vacuum tube 614 can be connected to the external vacuum extraction mechanism. Through the sealed passage formed by the flange and the connecting pipe 613, air is extracted into the vacuum chamber 601. According to the preset speed requirements of the rotating main shaft 606 driving the carbon fiber flywheel 609 in the flywheel energy storage core unit 6, the vacuum chamber 601 is evacuated to the corresponding vacuum level (the higher the speed, the higher the vacuum level required). This eliminates the air resistance when the flywheel rotates at high speed, greatly reduces wind resistance loss, and provides a stable low-resistance environment for the frictionless suspension rotation of the rotating main shaft 606 and the efficient kinetic energy storage of the carbon fiber flywheel 609. This ensures the energy conversion efficiency of the permanent magnet synchronous motor 611 and lays the vacuum environment foundation for the entire flywheel energy storage integrated device to quickly respond to grid frequency changes and improve the primary frequency regulation capability of the wind turbine.

[0035] In one embodiment, the carbon fiber flywheel 609 is fixedly connected to the rotating spindle 606 via the flywheel hub 608.

[0036] In one embodiment, the permanent magnet synchronous motor 611 includes a stator portion fixed on a stator base 610 and a rotor core 612 fixed on a rotating main shaft 606.

[0037] In this embodiment, the permanent magnet synchronous motor 611, through the collaborative structure of "stator section - rotor core 612", combined with the fixed support of the stator base 610 and the rotating main shaft 606, achieves efficient conversion of electrical energy and mechanical energy, providing key power support for the energy storage and release of the flywheel energy storage core unit 6. The stator base 610, as the fixed carrier of the stator section, can stably position the stator section at a preset position inside the vacuum chamber 601, ensuring that the stator section always maintains structural stability and providing a precise position reference for the subsequent electromagnetic induction process. The stator section fixed on the stator base 610, as the fixed end of the motor, can generate a stable alternating magnetic field when energized, providing a magnetic field basis for energy conversion. The rotor core 612, fixed on the rotating main shaft 606, rotates synchronously with the rotating main shaft 606, and its relationship with the stator section... Relative motion generates an electromagnetic induction effect—when the device is in the energy storage phase, the magnetic field generated by the stator drives the rotor core 612 to rotate, which in turn accelerates the rotating main shaft 606 and its carbon fiber flywheel 609, converting electrical energy into kinetic energy for storage. When the grid frequency fluctuates and energy needs to be released, the high-speed rotating carbon fiber flywheel 609 drives the rotating main shaft 606 and rotor core 612 to rotate. The rotor core 612 cuts the magnetic field of the stator, causing the stator to generate induced electrical energy, which is then transmitted to the grid through the transmission path to supplement the power deficit. This "fixed stator - rotating rotor with shaft" structural design not only ensures the high efficiency of energy conversion of the permanent magnet synchronous motor 611, but also forms a linkage with components such as the rotating main shaft 606 and carbon fiber flywheel 609, ensuring that the flywheel energy storage core unit 6 can quickly respond to primary frequency regulation needs, providing core energy conversion guarantee for improving the frequency regulation capability of wind turbine units.

[0038] In one embodiment, the wind turbine main shaft coupling unit 7 includes a bracket 701 fixed on the base plate 1, a torque sensor 703 mounted on the bracket 701, and an overrunning clutch 704 disposed between the torque sensor 703 and the input end of the generator 4.

[0039] In this embodiment, the wind turbine main shaft coupling unit 7 is mounted on the base plate 1. Through the coordinated operation of the bracket 701, torque sensor 703 and overrunning clutch 704, it realizes the stable transmission, real-time monitoring and safety protection of power between the wind turbine speed-increasing gearbox 2 and the generator 4, providing key guarantee for the stable output of electrical energy during the primary frequency regulation process of the device. The bracket 701, fixed on the base plate 1, serves as a support component, providing a stable mounting reference for the torque sensor 703. This ensures that the torque sensor 703 remains stable during device operation, preventing monitoring deviations caused by vibration or external forces and laying a structural foundation for accurate torque data acquisition. The torque sensor 703, mounted on the bracket 701, performs the dual functions of power transmission and real-time monitoring. One end is connected to the output end of the wind turbine speed-up gearbox 2, and the other end is connected to the overrunning clutch 704. While transmitting the power output from the speed-up gearbox to the generator 4, it can collect torque data in real time during the transmission process. If the detected torque exceeds a preset threshold, it can promptly feed the signal back to the control system so that the system can adjust the transmission ratio or energy distribution of the speed-up gearbox to prevent damage to the generator 4 or the speed-up gearbox due to torque overload. The overrunning clutch 704, located between the torque sensor 703 and the input end of the generator 4, with its unidirectional transmission characteristics, only allows power to be transmitted from the torque sensor 703 to the generator 4, effectively blocking the reverse rotation tendency of the generator 4 caused by grid frequency fluctuations and load changes. The entire wind turbine main shaft coupling unit 7 achieves efficient power transmission between the wind turbine speed-increasing gearbox 2 and the generator 4 through the complementary functions of its components. It also ensures the safety and stability of the transmission system through torque monitoring and unidirectional protection, providing a reliable transmission guarantee for the device to quickly respond to grid demands and stably output power during primary frequency regulation.

[0040] In one embodiment, the torque sensor 703 is connected to the output end of the wind turbine speed-increasing gearbox 2 via a second diaphragm-type flexible coupling 705.

[0041] In this embodiment, the connection structure between the torque sensor 703 and the output end of the wind turbine speed-increasing gearbox 2 via the second diaphragm-type flexible coupling 705 is a key link in achieving stable power transmission from the wind turbine speed-increasing gearbox 2 to the wind turbine main shaft coupling unit 7. On one hand, the second diaphragm-type flexible coupling 705 reliably receives the power transmitted from the output end of the wind turbine speed-increasing gearbox 2 and accurately transmits it to the torque sensor 703. The torque sensor 703 then further transmits the power to the overrunning clutch 704, ultimately driving the generator 4 to convert mechanical energy into electrical energy and feed it into the power grid, providing a stable power transmission path for the entire device's power generation function. On the other hand, relying on the structural characteristics of the diaphragm-type flexible coupling, it can effectively compensate for coaxiality deviations between the output end of the wind turbine speed-increasing gearbox 2 and the torque sensor 703 caused by installation errors, operational vibrations, etc., avoiding rigid stress and wear on components due to shaft misalignment. Simultaneously, it can buffer the vibrations generated during the operation of the wind turbine speed-increasing gearbox 2, reducing the transmission of vibrations to the torque sensor 703 and preventing vibration interference with the monitoring accuracy of the torque sensor 703.

[0042] In one embodiment, the generator 4 is fixed to the base plate 1 by a mounting platform 3.

[0043] As one specific implementation method: Device preparation and initialization: First, connect the vacuum tube 614, which is connected to the connecting pipe 613 on the right side of the vacuum chamber 601 in the flywheel energy storage core unit 6, to the external vacuum extraction mechanism. Start the vacuum pump and, according to the preset speed requirement of the rotating main shaft 606 driving the carbon fiber flywheel 609 (the higher the speed, the higher the vacuum requirement), extract air into the vacuum chamber 601 through the connecting pipe 613 and the vacuum tube 614. After the vacuum level reaches the standard, turn off the vacuum pump to keep the vacuum chamber 601 sealed to eliminate air resistance when the flywheel rotates at high speed. Then, power on the magnetic levitation bearing controller 603. The controller then injects air into the first magnetic levitation bearing 604 and the second magnetic levitation bearing 605 at both ends of the rotating main shaft 606 into the vacuum chamber 601. The magnetic levitation bearing 605 outputs control current to generate a stable magnetic field, causing the rotating main shaft 606 to disengage from mechanical contact and achieve frictionless levitation. At the same time, the controller monitors the main shaft's levitation status in real time and adjusts the magnetic field strength to ensure that the radial runout of the main shaft is ≤0.01mm. After the levitation is stable, the device enters the standby state. Finally, the signal acquisition function of the torque sensor 703 in the wind turbine main shaft coupling unit 7 is checked (to confirm that it can monitor the transmission torque normally), the one-way transmission performance of the overrunning clutch 704 (to prevent the generator 4 from rotating in reverse), the forward and reverse switching function of the permanent magnet synchronous motor 611, and the lubrication status of the wind turbine speed-increasing gearbox 2. After all components are fault-free, the device enters the operation preparation mode.

[0044] Normal Operation and Energy Storage: After capturing wind energy, the wind turbine drives the input end of the wind turbine speed-increasing gearbox 2 on the base plate 1 to rotate. The speed-increasing gearbox increases the low speed to a high speed that is compatible with the generator 4 and the flywheel energy storage core unit 6. On the other hand, the output end of the speed-increasing gearbox is connected to the torque sensor 703 of the wind turbine main shaft coupling unit 7 through the second diaphragm type flexible coupling 705. The torque sensor 703 transmits power to the overrunning clutch 704. Due to the one-way transmission characteristic of the overrunning clutch 704, the power can only be transmitted to the generator 4, ultimately driving the generator 4 to convert mechanical energy into electrical energy. On the one hand, the gearbox is connected to the power grid; on the other hand, the input end of the speed-increasing gearbox is connected to the rotating main shaft 606 of the flywheel energy storage core unit 6 through the first diaphragm type flexible coupling 607, which drives the rotating main shaft 606 to rotate synchronously. At this time, the permanent magnet synchronous motor 611 switches to "generator mode". The rotor core 612 rotates with the rotating main shaft 606 and cuts the magnetic field of the stator part on the stator base 610. Part of the generated electrical energy is used to maintain the operation of the device itself, and the other part drives the rotating main shaft 606 to accelerate, which drives the carbon fiber flywheel 609 fixed on the main shaft to rotate at high speed, converting electrical energy into kinetic energy storage.

[0045] Frequency regulation response and energy control: When the grid frequency is lower than the rated value (e.g., 50Hz), the control system determines that there is a "power deficit" and instructs the permanent magnet synchronous motor 611 to switch from "generator mode" to "motor mode". The kinetic energy stored in the carbon fiber flywheel 609 drives the rotating main shaft 606 to maintain or increase the speed. The rotating main shaft 606 transmits power to the wind turbine speed-increasing gearbox 2 through the first diaphragm type flexible coupling 607. The speed-increasing gearbox distributes the power to the power generation branch. At this time, the overrunning clutch 704 remains in the conducting state. The power is input to the generator 4 through the torque sensor 703 and the overrunning clutch 704, so that the generator 4 outputs additional electrical energy to supplement the grid power deficit. The system pushes the grid frequency back to its rated value. When the grid frequency is higher than the rated value, the control system determines that there is a "power surplus" and instructs the wind turbine to appropriately reduce the efficiency of wind turbine in capturing wind energy. At the same time, the wind turbine speed-up gearbox 2 increases the energy allocation to the flywheel energy storage core unit 6, and the permanent magnet synchronous motor 611 switches back to "generator mode". The electromagnetic force increases the rotational resistance of the rotating main shaft 606, causing the carbon fiber flywheel 609 to accelerate to absorb the surplus energy. The surplus electrical energy of the grid is converted into the kinetic energy storage of the flywheel. At the same time, the output power of the generator 4 to the grid is reduced to suppress the grid frequency from rising further. This achieves a rapid response to the primary frequency regulation of the grid and ensures the stability of the grid frequency.

[0046] It should be noted that all electrical components in this embodiment are connected to an external main controller and 220V AC mains power. The main controller can be a conventional known device such as a computer that performs control. The detailed description of known functions and components is omitted in the specific implementation of this disclosure. To ensure the compatibility of the device, the operating methods used are consistent with the parameters of commercially available instruments. The control system mentioned above is common knowledge known to those skilled in the art and will not be described in detail here.

[0047] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine generators, characterized in that, include: substrate(1); Wind turbine speed-increasing gearbox (2) and generator (4) are fixedly installed on the upper surface of the base plate (1). The wind turbine main shaft coupling unit (7) is installed between the wind turbine speed-increasing gearbox (2) and the generator (4); and The flywheel energy storage core unit (6) is mounted on the upper surface of the substrate (1) via a support (5). The input end of the wind turbine speed-increasing gearbox (2) is connected to the flywheel energy storage core unit (6) and the output end is connected to the input end of the generator (4) through the wind turbine main shaft coupling unit (7).

2. The flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine units according to claim 1, characterized in that, The flywheel energy storage core unit (6) includes: Vacuum chamber (601); Rotating spindle (606) is installed inside the vacuum chamber (601). A carbon fiber flywheel (609) is fixed to the rotating main shaft (606). Magnetic levitation bearing assemblies respectively disposed at both ends of the rotating main shaft (606); and A permanent magnet synchronous motor (611) is installed inside the vacuum chamber (601) and cooperates with the rotating main shaft (606).

3. The flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine units according to claim 2, characterized in that, The magnetic levitation bearing assembly includes: The first magnetic levitation bearing (604) is fixed inside the left side of the vacuum chamber (601). The second magnetic levitation bearing (605) is fixed inside the right side of the vacuum chamber (601); and A magnetic bearing controller (603) is disposed outside the vacuum chamber (601) and electrically connected to the first magnetic bearing (604) and the second magnetic bearing (605).

4. The flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine units according to claim 2, characterized in that, The left end of the rotating main shaft (606) is fixedly connected to the input end of the wind turbine speed-increasing gearbox (2) via a first diaphragm type flexible coupling (607).

5. The flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine units according to claim 2, characterized in that, A connecting pipe (613) is fixedly connected to the right side of the vacuum chamber (601), and a vacuum pipe (614) is connected to the right end of the connecting pipe (613) through a flange.

6. The flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine units according to claim 2, characterized in that, The carbon fiber flywheel (609) is fixedly connected to the rotating main shaft (606) via the flywheel hub (608).

7. The flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine units according to claim 2, characterized in that, The permanent magnet synchronous motor (611) includes a stator portion fixed on a stator base (610) and a rotor core (612) fixed on the rotating main shaft (606).

8. The flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine units according to claim 1, characterized in that, The wind turbine main shaft coupling unit (7) includes: A bracket (701) fixed on the substrate (1). A torque sensor (703) is mounted on the bracket (701); and An overrunning clutch (704) is disposed between the torque sensor (703) and the input end of the generator (4).

9. The flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine units according to claim 8, characterized in that, The torque sensor (703) is connected to the output end of the wind turbine speed-increasing gearbox (2) via a second diaphragm type flexible coupling (705).

10. The flywheel energy storage integrated device for improving the primary frequency regulation capability of wind turbine units according to claim 1, characterized in that, The generator (4) is fixed to the base plate (1) by the mounting platform (3).

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